Integrated anisotropic rock physics model
a rock physics model and anisotropy technology, applied in the field of geological prospecting, can solve the problems of stress-induced anisotropy being more difficult to predict, differentiating the closure of soft pore or crack in the rock, and first-order theories of little practical us
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[0045]The present inventive method was applied to log analysis and seismic modeling, and significant improvements were observed in S-wave prediction and well-to-seismic gather tie. FIGS. 5B-E compare the measured (darker curve) S-wave 52 (FIG. 5B) and density 54 (FIG. 5C) logs with the calculated (53, 55) using the traditional isotropic rock physics model. A consistent bias can be observed between the measured and the calculated over the sand intervals 51, corresponding to low values of Vsh, the shale volume fraction, which is shown as a function of depth in FIG. 5A. This was interpreted as the effect of stress-induced anisotropy in unconsolidated sands. FIGS. 5D (S-wave) and 5E (density) show that the present inventive method dramatically improves agreement between the calculated results 57, 59 and the measured data 52, 54 in the sand intervals 51.
[0046]In more detail, shear-wave and density logs can be predicted from the P-wave log (not shown) and the shale volume (shown in FIG. 5...
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